320 likes | 568 Views
The Role of Groundwater in Effective Water Management. Sonoma Valley Basin Advisory Panel May 31, 2007. John Woodling CA Department of Water Resources. Overview. What is Conjunctive Use? The State’s Role in Groundwater Management Data Programs Partnerships Grants Examples
E N D
The Role of Groundwater in Effective Water Management Sonoma Valley Basin Advisory Panel May 31, 2007 John Woodling CA Department of Water Resources
Overview • What is Conjunctive Use? • The State’s Role in Groundwater Management • Data Programs • Partnerships • Grants • Examples • American River • Kern County • Orange County • Climate Change
California Water Plan Additional Water from Management Strategies
Conjunctive Water Management • Coordinated use of surface and groundwater to increase water supply and improve reliability. GW SW CM
Elements of Conjunctive Use • Surface Water Source • Imported water • Local runoff • Treated wastewater • Conveyance • Recovery and Use • Extraction and direct use • Pump back to conveyance • Surface water exchange • Treatment • Conveyance • Recharge Method • Direct spreading • Injection • In-lieu recharge • Induced natural recharge • Institutions • Laws, Regulations, Ordinances • Contracts and Agreements • Political Support • Financing/Economics
The State’s Role GW Management Project Construction Capacity Building DATA PROGRAMS
DWR Bulletin 118 • Defined 520 basins in California • Hydrologic, physical, and political boundaries • GW also occurs in non-alluvial settings • Water Data Library • Map based interface for groundwater level data http://www.groundwater.water.ca.gov/bulletin118/index.cfm
Local Partnerships • Technical assistance • Facilitation • Stakeholder driven planning • Local development of projects
Local Groundwater Assistance Grants • $27 million in grants over five fiscal years • 128 studies and projects • Monitoring wells, sampling and analysis • Groundwater modeling • Aquifer testing and pilot studies • Well destruction • Groundwater storage feasibility studies • Management plan development
Construction Grants • Proposition 13 provided over $250 million for construction of conjunctive use facilities • Funded 63 projects • Yield of over 300,000 acre-feet of water annually • Total project costs over $1 billion through local cost share • Proposition 50 provides $500 million for multiple project categories
Proposition 84 $37 “…assist local public agencies to meet long term water needs of the state including the delivery of safe drinking water and the protection of water quality and the environment.” • $1 Billion for IRWM grants • $3-4 billion local cost share expected • Regional allocations • Projected 1.2 million acre-feet of water supply $73 $57 $138 $27 $60 $52 $215 $36 $114 $ in millions $91
Case Studies • American River Basin • Orange County • Kern County
American River Basin • Regional Conjunctive Use Program Folsom Reservoir American River Groundwater Basin Sacramento River
Conjunctive Use Program Concepts • In-lieu recharge alternatives centered around American and Sacramento River treatment plants, limited ASR • Conveyance to move surface water to traditional groundwater users in wet years • Extraction capability for traditional surface water users shift to groundwater in dry years • Integrated operation of Folsom Lake and the groundwater basin.
Institutional Controls • Sacramento Water Forum Agreement • Sacramento Groundwater Authority (SGA) • JPA of Cities of Sacramento, Citrus Heights and Folsom, and County of Sacramento. Representation delegated to water purveyor boards • Ensure equitable disbursement of costs and benefits • Responsible for monitoring and reporting in basin
Orange County Groundwater Replenishment System • Major Partners • OCWD • OC Sanitation District • Project Benefits • Provides 72 TAF supply • Reduces dependence on imported water • Utilizes investments in existing recharge, pumping and distribution facilities • Postpones need for new ocean outfall for wastewater • Enhances GW basin protection from seawater intrusion • Reduces effluent loading to ocean
Kern County Conjunctive Use Major Partners Kern County WA, Arvin-Edison WSD, Buena Vista WSD, Cawelo WD, Semitropic WSD, North Kern WSD & Kern Water Bank Authority Current projects • Increased recharge and extraction capacity • CVC enlargement • CVC – Friant Kern Intertie • Pumping plants for two-way Friant Kern Canal • $46 million in Prop 13 funding • Integrates all surface supplies • Improves dry-year yield
Increasing air temperature How will climate change affect you? Changes in precipitation Changes in runoff Sea level rise
Increasing Temperatures Projections From: Dettinger, 2005
Water Resource Impacts from Increased Temperatures • Less precipitation falling in the form of snow • Earlier snowmelt • Changes in water demand • Increased evapotranspiration losses • Changes in watershed vegetation and related changes in runoff • Increased water temperatures and increased demand for temperature control releases from reservoirs • Increased water temperatures and increased water column productivity (increased algae production, etc.)
Responses to Climate Change • Mitigation • AB 32 – reduced GHG emissions • Adaptation • Conservation • Surface Storage • Conjunctive Use • Land Use
Needs and Issues • Technical • Stream/Aquifer Interaction • Climate change • Environmental Benefits/Consequences • Water Quality Implications of Recharge • Subsidence Measurement and Monitoring • Improved Models • Energy relationships • Site Specific Factors • Science-based Policy
Needs and Issues • Political/Institutional • Land use • Water agency vs. County control • Public trust vs. private use • Water Quality • Legal • Water rights • Storage rights • Economic • Third party impacts • Benefit/Cost • Public funding